问题

________ it comes to the increasing use ofmotor vehicles in the cities，some people think it should be limited．

A:Because
B:Once
C:When
D:While

正确答案是：

同类题型

下面语段中画线的词语，使用不恰当的一项是(　　)建筑作为一种强制性的审美对象，一旦出现，谁的眼睛也躲不了，必须年年看、天天看。这对很多市民来说构成一种积极或消极的审美适应，对于青年学生来说则构成一种顺向或逆向的审美教育。结果，一个时代、一个民族的审美水平便水涨船高，或泥沙俱下。

They often had fun ______ ball games before. But now they have no time ______ after-school activities.

__________ — I like tennis and football best.

With the time passing by, I __ him.

Our voyage to Iceland cost a lot of money．一Did it ? well．that doesn’t matter you enjoy yourselves